In order to oxidise a mixture of one mole of each of `FeC_(2)O_(4).Fe_(2)(C_(2)O_(4))_(3),FeSO_(4)` and `Fe_(2)(SO_(4))_(3)` in acidic medium, the number of moles of `KMnO_(4)` required is:

Answer

2

Explanation

In acidic medium `KMnO_4` reduces to `Mn^(2+)`
`C_(2)O_(4)^(2-)` oxidizes to `CO_(2) ," "Fe^(2+)` oxides to `Fe^(3+)`
For `{:(FeC_2O_4,1+(1xx2),Fe^(+2)rarrFe^(+3)","C^(+3)rarrC^(+4)),(Fe_2(C_2O_4)_3,2xx3=6,C^(+3)rarrC^(+4)),(FeSO_4,1,Fe^(+2)rarrFe^(+2)),(Fe(SO_4)_3,0,"No oxidation"):}`
gm equivalents of `KMnO_4` = gm equivalents of `FeC_2O_4+` gm equivalents of `Fe_2(C_2O_4)_3+` gm equivalent of `FeSO_4+" gm of " Fe_2(SO_4)_3`
`("moles "xxn_f) _(KMnO_4)=("moles"xxn_f)FeC_2O_4+("moles"xxnf)_(Fe_2(C_2O_4)_3)+("moles" xxn_f)_(FeSo_4)+("moles "xxn_f)_(Fe_2(SO_4)_3)`
`("moles")_(KMnO_4)xx5=(1xx3)+(1xx6)+(1xx1)+(1xx0)`
`("moles" )_(KMnO_4)=2`